linux-kernel - [PATCH 3/5] mips: Use common fork_idle_from

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Date:	Tue,  6 Mar 2012 13:41:12 -0800
From:	Venkatesh Pallipadi <venki@...gle.com>
To:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Aaron Durbin <adurbin@...gle.com>,
	Paul Turner <pjt@...gle.com>,
	Yong Zhang <yong.zhang0@...il.com>,
	linux-kernel@...r.kernel.org, Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Venkatesh Pallipadi <venki@...gle.com>
Subject: [PATCH 3/5] mips: Use common fork_idle_from_wq in smpboot

Cleanup. Instead of reimplementing fork_idle on wq and idle task caching,
use fork_idle_from_wq().

Signed-off-by: Venkatesh Pallipadi <venki@...gle.com>
---
 arch/mips/kernel/smp.c |   47 +++--------------------------------------------
 1 files changed, 3 insertions(+), 44 deletions(-)

diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 32c1e95..37a4133 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -191,54 +191,13 @@ void __devinit smp_prepare_boot_cpu(void)
  * and keep control until "cpu_online(cpu)" is set.  Note: cpu is
  * physical, not logical.
  */
-static struct task_struct *cpu_idle_thread[NR_CPUS];
-
-struct create_idle {
-	struct work_struct work;
-	struct task_struct *idle;
-	struct completion done;
-	int cpu;
-};
-
-static void __cpuinit do_fork_idle(struct work_struct *work)
-{
-	struct create_idle *c_idle =
-		container_of(work, struct create_idle, work);
-
-	c_idle->idle = fork_idle(c_idle->cpu);
-	complete(&c_idle->done);
-}
-
 int __cpuinit __cpu_up(unsigned int cpu)
 {
 	struct task_struct *idle;
 
-	/*
-	 * Processor goes to start_secondary(), sets online flag
-	 * The following code is purely to make sure
-	 * Linux can schedule processes on this slave.
-	 */
-	if (!cpu_idle_thread[cpu]) {
-		/*
-		 * Schedule work item to avoid forking user task
-		 * Ported from arch/x86/kernel/smpboot.c
-		 */
-		struct create_idle c_idle = {
-			.cpu    = cpu,
-			.done   = COMPLETION_INITIALIZER_ONSTACK(c_idle.done),
-		};
-
-		INIT_WORK_ONSTACK(&c_idle.work, do_fork_idle);
-		schedule_work(&c_idle.work);
-		wait_for_completion(&c_idle.done);
-		idle = cpu_idle_thread[cpu] = c_idle.idle;
-
-		if (IS_ERR(idle))
-			panic(KERN_ERR "Fork failed for CPU %d", cpu);
-	} else {
-		idle = cpu_idle_thread[cpu];
-		init_idle(idle, cpu);
-	}
+	idle = fork_idle_from_wq(cpu);
+	if (IS_ERR(idle))
+		panic(KERN_ERR "Fork failed for CPU %d", cpu);
 
 	mp_ops->boot_secondary(cpu, idle);
 
-- 
1.7.7.3

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